“When we arrived, a couple of people were trying to get the door open and get the women out,” she previously told Lincolnshire Live.

“I felt quite shocked, especially being a student nurse. It did make me think about things. But I just made sure she was comfortable as much as she could be and that she was warm enough. But yes, it was very shocking.”

A Lincolnshire Police spokesman said the investigation was ongoing.

Anyone with information is asked to call 101 quoting incident number 405 of August 3.